Update clang-tools to ab/6234826 am: 746b022bbb am: 04385f8580

Change-Id: Ia53cc05ff6057f7024f6ac9f529a6d1cf1fd8b5d
tree: c3fed767cc5e3fd4ee6a7e3bc76939869352c4f5
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml